A reminder: while on an escalator, stand on the right. If people want to pass you, they'll do so on the left. Yoni Alter, a Londoner, thinks these footprints would help educate tourists about Tube etiquette.

As long as you have the foot prints painted on the escalator, which side doesn't matter, does it? I think it is a great idea, and escalators should be equipped this way all the time. You would not have to have each step painted. Every 5th step with a pair of feet, and two steps with one left and one right ought to suffice.